EP 0122529 A1 19841024 - A method for surface hardening a ferrous-alloy article and the resulting product.

Title (en)

A method for surface hardening a ferrous-alloy article and the resulting product.

Title (de)

Verfahren zum Oberflächenhärten eines Gegenstandes aus einer Eisenlegierung und so erhaltenes Produkt.

Title (fr)

Méthode pour endurcir la surface d'un objet en alliage ferreux et produit en résultant.

Publication

EP 0122529 A1 19841024 (EN)

Application

EP 84103561 A 19840330

Priority

JP 6279683 A 19830408

Abstract (en)

A method of providing the surface of a ferrous alloy article containing at least 0.2% by weight of carbon with a surface layer composed of the nitrocarbide of an element of Group Va of the periodic table and an inner ferrous alloy layer containing nitrogen located immediately below the surface layer. The layers are formed by (a) nitriding the article surface and (b) a thermal diffusion treatment thereof with a treating agent containing the Group Va element. The formation of the layers can be accomplished easily and rapidly without presenting any problem when the article is later hardened.

IPC 1-7

C23C 9/16; C23C 11/18; C21D 1/06; C21D 3/08

IPC 8 full level

C23C 10/02 (2006.01); C23C 12/00 (2006.01); C23C 28/00 (2006.01)

CPC (source: EP)

C23C 10/02 (2013.01); C23C 12/00 (2013.01); C23C 28/00 (2013.01)

Citation (search report)

[Y] DE 2829976 A1 19790118 - TOYODA CHUO KENKYUSHO KK
[Y] GB 2055404 A 19810304 - LUCAS INDUSTRIES LTD
[Y] GB 2030600 A 19800410 - KAWASAKI HEAVY IND LTD
[Y] US 4342605 A 19820803 - WATANABE TERUOKI, et al
[Y] PATENT ABSTRACTS OF JAPAN, unexamined applications, C field, vol. 6, no. 149, August 10, 1982 THE PATENT OFFICE JAPANESE GOVERNMENT page 100 C 118 & JP-A-57 070 270 (toyoda chuo kenkyusho k.k.)

Designated contracting state (EPC)

CH DE FR GB IT LI SE

DOCDB simple family (publication)

EP 0122529 A1 19841024; EP 0122529 B1 19870318; AU 2633784 A 19841011; AU 542081 B2 19850207; CA 1218585 A 19870303; DE 3462701 D1 19870423; JP S59190355 A 19841029; JP S622628 B2 19870121

DOCDB simple family (application)

EP 84103561 A 19840330; AU 2633784 A 19840402; CA 451474 A 19840406; DE 3462701 T 19840330; JP 6279683 A 19830408